DYNAMIC SIGNAL TRANSMISSION STRUCTURE AND BEAMFORMING METHOD

• US 20200136698A1
• Filed: 10/22/2019
• Published: 04/30/2020
• Est. Priority Date: 10/24/2018
• Status: Active Grant

• Current Assignee: Shenzhen Institute Of Terahertz Technology And Innovation Co., Ltd.
• Original Assignee: Shenzhen Institute Of Terahertz Technology And Innovation Co., Ltd.
• Inventors: Ding, Qing, Han, Chong, Li, Chen, Yan, Shitao
• Granted Patent: US 10,965,358 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0686 Hybrid systems, i.e. switching and simultaneous transmission
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A dynamic signal transmission structure based on a hybrid beamforming technology includes a radio-frequency module and an antenna array connected therewith. The radio-frequency module includes one or more radio-frequency link units connected in parallel, the antenna array includes one or more antenna sub-arrays, and each antenna sub-array is connected with one of the radio-frequency modules. The hybrid beamforming technology includes analog and digital beamforming. In this structure, the analog beamforming parameters and the digital beamforming parameters are constant, and the number of radio-frequency link units in the radio-frequency module, the number of antenna sub-arrays in the antenna array, the analog beamforming parameters, and the digital beamforming parameters are in a quantitative relation. The structure of the antenna array and the number of radio-frequency link units in each radio-frequency module can be adjusted dynamically under the condition where the performance is guaranteed, and accordingly, the hardware complexity is reduced.

Claims

1. A dynamic signal transmission structure based on a hybrid beamforming technology, comprising a radio-frequency module and an antenna array connected with the radio-frequency module, wherein:

the radio-frequency module comprises one or more radio-frequency link units connected in parallel;

the antenna array comprises one or more antenna sub-arrays, and each said antenna sub-array is connected with one of said radio-frequency modules;

the hybrid beamforming technology comprises analog beamforming and digital beamforming; and

in the structure, analog beamforming parameters and digital beamforming parameters are constant, and the number of the radio-frequency link units in the radio-frequency module, the number of the antenna sub-arrays in the antenna array, the analog beamforming parameters and the digital beamforming parameters are in a quantitative relation.

2. The dynamic signal transmission structure according to claim 1, wherein the antenna sub-array comprises a plurality of antennae, each said radio-frequency link unit in the radio-frequency module is connected with each said antenna in the corresponding antenna sub-array, and a modulator is connected in series between each said radio-frequency link unit in the radio-frequency module and each said antenna in the corresponding antenna sub-array.

3. The dynamic signal transmission structure according to claim 2, wherein the modulator is a phase shifter.

4. A beamforming method, comprising:

designing an antenna array, and dividing the antenna array into one or more antenna sub-arrays, wherein each said antenna sub-array is controlled by a radio-frequency module;

determining the number of radio-frequency link units in the radio-frequency module;

establishing a channel model of a required frequency band of electromagnetic waves;

obtaining analog beamforming parameters and digital beamforming parameters by calculation according to a channel matrix in the channel model; and

carrying out beamforming according to the analog beamforming parameters and the digital beamforming parameters.

5. The beamforming method according to claim 4, wherein the obtaining the analog beamforming parameters and the digital beamforming parameters by calculation according to the channel matrix in the channel model comprises:

carrying out singular value decomposition on the channel matrix in the channel model to obtain a solution to a right singular-value matrix; and

obtaining the analog beamforming parameters and the digital beamforming parameters according to the solution to the right singular-value matrix.

6. The beamforming method according to claim 5, wherein the analog beamforming parameters and the digital beamforming parameters are obtained by calculation according to the solution to the right singular-value matrix and based on a sparse coding algorithm.

7. The beamforming method according to claim 5, wherein a maximum frequency spectral efficiency of hybrid beamforming of a dynamic signal transmission structure is solved to obtain a relation between the solution to the right singular-value matrix, and the analog beamforming parameters and the digital beamforming parameters.

8. The beamforming method according to claim 7, wherein an algorithm for maximizing the frequency spectral efficiency of hybrid beamforming of the dynamic signal transmission structure is obtained, based on an actual transmission signal, a pre-coded and combined equivalent channel, and a combined noise covariance matrix.

9. The beamforming method according to claim 4, wherein the channel model of the frequency band of the electromagnetic waves is established based on a ray tracing technology.

10. The beamforming method according to claim 4, wherein the channel model of the frequency band of the electromagnetic waves is a multi-user, multi-input and multi-output channel model.